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  <dxl:Comment><![CDATA[
    Test case: Infer predicate in a subquery, based on a constraint in the
               parent query. Expect a plan with a predicate bar.b < 2.

    drop table if exists foo, bar;
    create table foo(a int, b int) distributed by (a);
    create table bar(a int, b int) distributed by (a);

    set optimizer_enumerate_plans = on;
    explain
    select *
    from   foo
    where  (foo.a =10 or foo.a >all (select max(bar.a) from bar where foo.b=bar.b
                                     union all
                                     select b from bar where foo.b=bar.b))
       and foo.b < 2;


                                                                   QUERY PLAN
    -----------------------------------------------------------------------------------------------------------------------------------------
     Gather Motion 3:1  (slice3; segments: 3)  (cost=0.00..1765388.27 rows=1 width=8)
       ->  Result  (cost=0.00..1765388.27 rows=1 width=8)
             Filter: ((foo.a = 10) OR ((SubPlan 1) = true))
             ->  Seq Scan on foo  (cost=0.00..1765388.25 rows=334 width=9)
                   Filter: (b < 2)
             SubPlan 1  (slice3; segments: 3)
               ->  Result  (cost=0.00..862.00 rows=1 width=1)
                     ->  Aggregate  (cost=0.00..862.00 rows=1 width=16)
                           ->  Result  (cost=0.00..862.00 rows=2 width=8)
                                 ->  Append  (cost=0.00..862.00 rows=2 width=4)
                                       ->  Aggregate  (cost=0.00..431.00 rows=1 width=4)
                                             ->  Result  (cost=0.00..431.00 rows=1 width=4)
                                                   Filter: (foo.b = bar.b)
                                                   ->  Materialize  (cost=0.00..431.00 rows=1 width=8)
                                                         ->  Broadcast Motion 3:3  (slice1; segments: 3)  (cost=0.00..431.00 rows=1 width=8)
                                                               ->  Seq Scan on bar  (cost=0.00..431.00 rows=1 width=8)
                                                                     Filter: (b < 2)
                                       ->  Result  (cost=0.00..431.00 rows=1 width=4)
                                             Filter: (foo.b = bar_1.b)
                                             ->  Materialize  (cost=0.00..431.00 rows=1 width=4)
                                                   ->  Broadcast Motion 3:3  (slice2; segments: 3)  (cost=0.00..431.00 rows=1 width=4)
                                                         ->  Seq Scan on bar bar_1  (cost=0.00..431.00 rows=1 width=4)
                                                               Filter: (b < 2)
  ]]>
  </dxl:Comment>
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